Least cost routing with repeated searches for lower cost route
First Claim
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1. A method of least cost routing through a communications network, comprising the steps of:
- a) detecting a least cost route through the network in response to a request from a calling subscriber;
b) establishing a first connection along the least cost route for connecting the calling subscriber and a called subscriber;
c) detecting a route through the network, said route having a cost lower than the cost of the route detected by the step (a); and
d) establishing a second connection along the route detected by the step (c) for connecting the calling and called subscribers, instead of via the first connection.
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Abstract
In a communications network, a database is searched for a least cost route in response to a call request from a subscriber, and a connection is established along the least cost route between the calling subscriber and a called subscriber. For the duration of the call, the database is repeatedly searched for a route having a cost lower than the cost of a previously determined route. If the route of lower cost is detected, a new connection is established along the lower cost route, instead of the currently established connection.
57 Citations
14 Claims
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1. A method of least cost routing through a communications network, comprising the steps of:
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a) detecting a least cost route through the network in response to a request from a calling subscriber; b) establishing a first connection along the least cost route for connecting the calling subscriber and a called subscriber; c) detecting a route through the network, said route having a cost lower than the cost of the route detected by the step (a); and d) establishing a second connection along the route detected by the step (c) for connecting the calling and called subscribers, instead of via the first connection. - View Dependent Claims (2)
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3. A method of least cost routing through a communications network, comprising the steps of:
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a) detecting a least cost route through a communications network in response to a request from a calling subscriber; b) establishing a connection along the least cost route between the calling subscriber and a called subscriber; c) making a search through the network for a route having a cost lower than the cost of a previously determined route; d) if the route of lower cost is detected by the step (c), establishing a connection along the lower cost route, instead of the currently established connection; and e) repeating the steps (c) and (d). - View Dependent Claims (4)
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5. A method of least cost routing through a communications network, comprising the steps of:
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a) making a search through a database for a least cost route in response to a request from a calling subscriber; b) establishing a connection along the least cost route between the calling subscriber and a called subscriber; c) making a search through the database for a route having a cost lower than the cost of a previously determined route; d) if the route of lower cost is detected by the step (c), establishing a connection along the lower cost route, instead of the currently established connection; and e) repeating the steps (c) and (d). - View Dependent Claims (6)
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7. A communications network comprising:
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a database for making a first search for a least cost route in response to a request packet and sending a reply packet containing data of said least cost route; and a plurality of network nodes interconnected by communication links, each of said network nodes functioning as an originating node for sending said request packet to said database in response to a call request from a calling subscriber, said originating node being responsive to said reply packet for establishing a first connection along the least cost route determined by the database between the calling subscriber and a called subscriber, said database making a second search for a route having a cost lower than the cost of said least cost route, and sending a second reply packet containing data of the route of lower cost, said originating node being responsive to the second reply packet for establishing a second connection along the route of lower cost, instead of the first connection. - View Dependent Claims (8, 9)
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10. A communications network comprising:
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a central database for holding tariff data and producing a search program based on the tariff data; and a plurality of network nodes interconnected by communication links, each of said network nodes comprising a local database and functioning as an originating node for making a first search through the local database for a least cost route in response to a call request from a calling subscriber using said search program, and establishing a first connection along the least cost route between the calling subscriber and a called subscriber, said originating node making a second search through the local database for a route having a cost lower than the cost of said least cost route using said search program and establishing a second connection along the route of lower cost, instead of the first connection. - View Dependent Claims (11, 12, 13, 14)
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Specification